[PATCH v1 1/7] drm/mediatek: move dpi private data to device

[ck.hu@mediatek.com (CK Hu)]

Hi, Bibby:

Some inline comment.

On Mon, 2018-05-14 at 15:52 +0800, Bibby Hsieh wrote:
> From: chunhui dai <chunhui.dai@mediatek.com>
> 
> move clock factor and edge enable setting to private data.
> 

I think this modification is to separate different part of dpi driver
for different chip.
Describe more for this.


> Signed-off-by: chunhui dai <chunhui.dai@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c      | 82 ++++++++++++++++++++++++++-------
>  drivers/gpu/drm/mediatek/mtk_dpi_regs.h |  2 +-
>  2 files changed, 66 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index e80a603e5fb0..993dc44368bd 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -71,11 +71,13 @@ struct mtk_dpi {
>  	struct clk *tvd_clk;
>  	int irq;
>  	struct drm_display_mode mode;
> +	const struct mtk_dpi_conf *conf;
>  	enum mtk_dpi_out_color_format color_format;
>  	enum mtk_dpi_out_yc_map yc_map;
>  	enum mtk_dpi_out_bit_num bit_num;
>  	enum mtk_dpi_out_channel_swap channel_swap;
>  	bool power_sta;
> +	int refcount;
>  	u8 power_ctl;
>  };
>  
> @@ -115,6 +117,12 @@ struct mtk_dpi_yc_limit {
>  	u16 c_bottom;
>  };
>  
> +struct mtk_dpi_conf {
> +	unsigned int (*cal_factor)(int clock);
> +	const u32 reg_h_fre_con;
> +	bool edge_sel_en;
> +};
> +
>  static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
>  {
>  	u32 tmp = readl(dpi->regs + offset) & ~mask;
> @@ -340,7 +348,13 @@ static void mtk_dpi_config_swap_input(struct mtk_dpi *dpi, bool enable)
>  
>  static void mtk_dpi_config_2n_h_fre(struct mtk_dpi *dpi)
>  {
> -	mtk_dpi_mask(dpi, DPI_H_FRE_CON, H_FRE_2N, H_FRE_2N);
> +	mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, H_FRE_2N, H_FRE_2N);
> +}
> +
> +static void mtk_dpi_config_disable_edge(struct mtk_dpi *dpi)
> +{
> +	if (dpi->conf->edge_sel_en)
> +		mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0, EDGE_SEL_EN);
>  }
>  
>  static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
> @@ -368,6 +382,12 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
>  
>  static void mtk_dpi_power_off(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
>  {
> +	if (WARN_ON(dpi->refcount == 0))
> +		return;
> +
> +	if (--dpi->refcount != 0)
> +		return;
> +

I think 'refcount' should be moved to an independent patch.

>  	dpi->power_ctl &= ~pctl;
>  
>  	if ((dpi->power_ctl & DPI_POWER_START) ||
> @@ -385,16 +405,19 @@ static void mtk_dpi_power_off(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
>  
>  static int mtk_dpi_power_on(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
>  {
> -	int ret;
> +	int ret = 0;
> +
> +	if (++dpi->refcount != 1)
> +		return 0;
>  
>  	dpi->power_ctl |= pctl;
>  
>  	if (!(dpi->power_ctl & DPI_POWER_START) &&
>  	    !(dpi->power_ctl & DPI_POWER_ENABLE))
> -		return 0;
> +		goto err_refcount;
>  
>  	if (dpi->power_sta)
> -		return 0;
> +		goto err_refcount;
>  
>  	ret = clk_prepare_enable(dpi->engine_clk);
>  	if (ret) {
> @@ -416,6 +439,8 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
>  	clk_disable_unprepare(dpi->engine_clk);
>  err_eng:
>  	dpi->power_ctl &= ~pctl;
> +err_refcount:
> +	dpi->refcount--;
>  	return ret;
>  }
>  
> @@ -433,16 +458,13 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
>  	unsigned long pll_rate;
>  	unsigned int factor;
>  
> +	if (!dpi) {
> +		dev_err(dpi->dev, "invalid argument\n");
> +		return -EINVAL;
> +	}
>  	/* let pll_rate can fix the valid range of tvdpll (1G~2GHz) */
>  	pix_rate = 1000UL * mode->clock;
> -	if (mode->clock <= 27000)
> -		factor = 16 * 3;
> -	else if (mode->clock <= 84000)
> -		factor = 8 * 3;
> -	else if (mode->clock <= 167000)
> -		factor = 4 * 3;
> -	else
> -		factor = 2 * 3;
> +	factor = dpi->conf->cal_factor(mode->clock);
>  	pll_rate = pix_rate * factor;
>  
>  	dev_dbg(dpi->dev, "Want PLL %lu Hz, pixel clock %lu Hz\n",
> @@ -518,6 +540,7 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
>  	mtk_dpi_config_yc_map(dpi, dpi->yc_map);
>  	mtk_dpi_config_color_format(dpi, dpi->color_format);
>  	mtk_dpi_config_2n_h_fre(dpi);
> +	mtk_dpi_config_disable_edge(dpi);

What does this do? Separate this to an independent patch and describe
what does this do.

>  	mtk_dpi_sw_reset(dpi, false);
>  
>  	return 0;
> @@ -656,6 +679,31 @@ static const struct component_ops mtk_dpi_component_ops = {
>  	.unbind = mtk_dpi_unbind,
>  };
>  
> +static unsigned int mt8173_calculate_factor(int clock)
> +{
> +	if (clock <= 27000)
> +		return 16 * 3;
> +	else if (clock <= 74250)

Why do you change 84000 to 74250? If 74250 is correct for mt8173, use a
new patch for this bug fix.

Regards,
CK

> +		return 8 * 3;
> +	else if (clock <= 167000)
> +		return 4 * 3;
> +	else
> +		return 2 * 3;
> +}
> +
> +static const struct mtk_dpi_conf mt8173_conf = {
> +	.cal_factor = mt8173_calculate_factor,
> +	.reg_h_fre_con = 0xe0,
> +};
> +
> +static const struct of_device_id mtk_dpi_of_ids[] = {
> +	{ .compatible = "mediatek,mt8173-dpi",
> +	  .data = &mt8173_conf,
> +	},
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, mtk_dpi_of_ids);
> +
>  static int mtk_dpi_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -663,13 +711,18 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>  	struct resource *mem;
>  	struct device_node *bridge_node;
>  	int comp_id;
> +	const struct of_device_id *match;
>  	int ret;
>  
> +	match = of_match_node(mtk_dpi_of_ids, dev->of_node);
> +	if (!match)
> +		return -ENODEV;
>  	dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
>  	if (!dpi)
>  		return -ENOMEM;
>  
>  	dpi->dev = dev;
> +	dpi->conf = (struct mtk_dpi_conf *)match->data;
>  
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	dpi->regs = devm_ioremap_resource(dev, mem);
> @@ -748,11 +801,6 @@ static int mtk_dpi_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static const struct of_device_id mtk_dpi_of_ids[] = {
> -	{ .compatible = "mediatek,mt8173-dpi", },
> -	{}
> -};
> -
>  struct platform_driver mtk_dpi_driver = {
>  	.probe = mtk_dpi_probe,
>  	.remove = mtk_dpi_remove,
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> index 4b6ad4751a31..d9db8c4cacd7 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> @@ -223,6 +223,6 @@
>  #define ESAV_CODE2			(0xFFF << 0)
>  #define ESAV_CODE3_MSB			BIT(16)
>  
> -#define DPI_H_FRE_CON		0xE0
> +#define EDGE_SEL_EN			BIT(5)
>  #define H_FRE_2N			BIT(25)
>  #endif /* __MTK_DPI_REGS_H */